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Application rates, design areas, areas of coverage, positioning, and minimum design pressures shall be in accordance with the listings of the specific residential sprinklers used.
The number of design sprinklers includes all sprinklers within a compartment to a maximum of two sprinklers.
The water demand for the system shall be determined by multiplying the design discharge per manufacturer's listing by the number of design sprinklers.
Sprinklers shall be positioned so that the discharge is not obstructed by beams or light fixtures.
When tests are performed which show that sprinklers are positioned so that discharge is not obstructed, sprinklers shall be installed in accordance with the test results.
Piping shall be sized hydraulically in accordance with the methods described in NFPA 13-2013 and as modified in this section. A sufficient number of calculations shall be made to insure adequate pipe sizing for the various design discharges for which the residential sprinkler is listed.
Minimum size shall be one-inch for copper and steel.
Pressure drop in water meters shall be based on the meter manufacturer's data.
Piping configurations may be looped, gridded, straight run or combinations thereof.
Sprinklers shall be installed in all areas except as follows:
(a) Sprinklers may be omitted from bathrooms not exceeding 55 square feet in area with noncombustible plumbing fixtures.
(b) Sprinklers may be omitted from closets where the least dimension does not exceed three feet and the area does not exceed 24 square feet and the walls and ceiling are surfaced with noncombustible materials.
(c) Sprinklers may be omitted from open attached porches.
(e) Sprinklers may be omitted from attics which are not used or intended for living purposes or storage.
(Prior code § 91-135; Added Coun. J. 12-21-84, p. 12140; Amend Coun. J. 9-6-17, p. 55278, Art. VII, § 33)